Hugo - How did I make my ESP8266 remote? : r/esp8266
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
Any clever way to provide 3.3V with good current output from a 9V battery? - Electrical Engineering Stack Exchange
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
Problem powering ESP8266 with two 1.5V AA cells - Electrical Engineering Stack Exchange
Wifi Controlled Motors using ESP8266 and ATtiny85
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
Dual 18650 Lithium Battery Shield V8 3V1A 5V 3A Micro USB Power Bank Battery Charging Module For Raspberry Pi Wifi ESP8266 ESP32|Integrated Circuits| - AliExpress
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
AReResearch - Andy Reischle: Failed making the smallest WiFi throwie ever
Adventures in deep sleep with ESP8266 and a temperature sensor – Tomas McGuinness
One ESP8266, One Battery, One Year… And Counting. | Hackaday
Power Supply for NodeMCU with Battery Charger & Booster
Battery Powered ESP8266 IoT - Temperature Sensor - Home Circuits